Convergence–shear diagrams for the ellipsoidal NFW lens with κ_s = 0.25 and eccentricities e ∈ {0, 0.6, 0.811, 0.9} as marked in the panels. In the top row with e = 0 the green curve marks the (κ, γ) combinations occurring in the lens plane as a function of radius a marked by the green tick marks. In each of the three lower rows the magenta band marks the (κ, γ) combinations occurring in the lens plane, with its vertical cross-sections indicating the shear range along the ellipse with semi-major axis a. The red and blue curves mark the shear along the major and minor axis, respectively. For reading the image properties from the diagrams, see Sect. 4.5.1.